Ventilating apparatus



F. C. KILB VENTILATING APPARATUS May 18, 1937.

Filed July 3, 1956 3 Sheets-Sheet 1 INVENTOR VENTILAT ING APPARATUSFiled July 3, 1936 3 Sheets-Sheet 2 /4 Y 25 @1I- ifa Je 4(5) 25 W 'ATTRNEY Patented May 18, 19374 PATENT OFFICE VENTILATING APPARATUS FrancisC. Kilb, Larchmont, N. Y., assignor to American Radiator Company, NewYork, N. Y., a corporation of New Jersey 16 Claims.

My invention relates to Ventilating apparatus, and more particularly toapparatus of this type which is adapted for installation in windows ofrooms, and which operates to admit fresh, filtered air into the roomand/or to exhaust stale room air to the outside atmosphere.

My invention has for one of its objects to. provide Ventilatingapparatus which-is of improved construction and arrangement .of parts,,and which, when installed in a window opening, is neat and pleasing inappearance, and can be easily and quickly serviced.

A further and more specific object is to provide an improved form ofcasing structure for ventilating apparatus, which is divided into twoparts,

one of which is xedly secured in position over the window sill, and theother of which can be readily removed from and `replaced on the firstpart without disturbing the mounting of the first part in the window;whereby the interior working parts may be inspected and minor repairsmade thereto without removal from the casing, or whereby the workingparts may be readily removed from the casing and the second partreplaced on the rst part and major repairs made to the interior workingparts at a remote service station.

Without imposing any limitation on the invention in its broader aspects,a still further object is to provide an improved form of casingstructure for Ventilating apparatus which is adapted to be ,mountedcentrally of an opening defined by a (partially raised window sash and awindow sill,

p with a front half inside of the room and a rear Cab ' half outside ofthe room; and which, when mounted in position, eifectively conceals theconnection thereto of the side ller blocks and effectively provides forthe drainage of rain water from the exposed parts thereof disposedoutside of the window.

The invention consists in the novel construction and combination ofparts, to be more fully described hereinafter, and the novelty of whichwill be particularly pointed out and distinctly, claimed.

In the accompanying drawings, to be taken as a part of thisspecification, I have fully and clearly Application .my s. 193s, serialNo'. 88,701

' (ci. eis-94) being broken away to show the interior of the ventilatorcasing;` Y

Fig3 is an end elevation of my improved form of Ventilating apparatusillustrating. its division into a base unit anda removable cover unit,and 5 showing the cover unit as removed from the base unit;

Fig. 4 is a rear elevation of the removed cover unit, showing theinterior construction thereof;

Fig. 5 is a front elevation of the base unit with l0 the cover unitremoved;

Fig. 6 is a fragmentary horizontal sectional view illustrating the meansatthe ends of the ventilator for securing the cover unit to the baseunit; 15 Fig. '7 is a fragmentary perspective view'showing more indetail the base unit and the removable cover unit and the means fordetachably connecting the two together, the removable inner workingparts of the casing and certain of the 20 fixed parts being omitted; and

Fig. 8 is an enlarged fragmentary sectional view through the lower frontportion of the Ventilating apparatus, as viewed in Fig. 1, and showingthe detail structure of the operating means for the 25 motor switch.

Referring now in detail to the construction illustrated, the referencenumeral I0 indicates a sill of a window, the numeral Il a lower sillrail of a windowzsash I2, and the numeral I3 the win- 30 i dow jambs. Aventilator I4 is arranged centrally within the opening defined by thelower sill rail II and the window sill Ill, with its rear part extendingoutside of the window and itse front part extending into the room.Filler blocks I5 are ar- 35 ranged at the ends of the ventilator, andserve to close the spaces between the ends of the ventilator and thewindow jambs I3. The blocks I5 are the same height as the casing; and,when the window sash is lowered against the top of the casing, the lowersurface of the sill rail has a sealing engagement with the top surfacesof the filler blocks as well as the top of the ventilator.

The ventilator comprises a casing I6 including a front wall l1, a rearwall I8, a top wall I9, a bottom wall 20, and end walls 2|. The rearwall I8 is provided with an inlet opening 22 extending for the fulllength of the casing, and having fixed louvers 23 positioned therein forpreventing the entrance of rain or snow. A lter 24 is removably 50mounted in verticalguides 25 and extends across the forward side of theopening 22, and thereby serves to eliminate dust, foreign particles andthe like from the entering air.k The front wall I1 is provided with alouver-controlled outlet opening 26 extending for substantially the fulllength of the casing. Likewise, the forward part of the top wall I9 isprovided with louver-controlled outlet openings 21.

An upright partition 28 extends lengthwise of the casing and divides thelatter into a rear inlet chamber 29 communicating through the lter 24and inlet opening 22 with the outside atmosphere, and into an outletchamber 30 communicating through the outlet openings 26 and 21 with theroom. A motor-driven blower unit 3| is removably mounted within theinlet chamber 29 and serves to force air from the inlet chamber throughopenings 32 in the partition 28 and into the outlet chamber 3D, fromwhence it passes through the openings 26 and 21 and into the room. Themotor-driven blower unit 3| is fixedly` secured to a supporting basemember 33, and the latter is supported by the bottom wall 20 and ispositioned between longitudinally extending parallel guides 34 and 35suitably spot welded to the bottom wall 20. The base member 33,motor-blower unit 3| and partition 28 are all secured together and maybe installed and removed as a unit. The partition 28 is secured bysuitable screws 36 to the upper part of the motor-blower unit 3| and byscrews 31 to brackets 38 extending forwardly 4from and carried by thebase member 33. Suit-- able wing nuts 39 and bolts 40 passing throughthe bottom wall 28, serve to secure the base member 33 to the bottomwall of the casing.

Each of the end walls 2| of the casing is divided along an uprightcentral line into a front section 45 and a rear section 46, the divisionlines being shown as Vertical and as being the same distance from theplane of the front wall I1. The top wall of the casing is divided alonga longitudinal line into a front section 41 and a rear section 48, theline of division between the two sections of the top wall being insubstantially the same vertical plane as the lines of division betweenthe two sections of the end walls, and the ventilator casing being soarranged with respect to the window sash that such plane is just forwardof the plane of the window sash, as can be clearly seen from anexamination of Figs.` 1 and 2. The rear section 48 of the top wall is.hinged as indicated at 49 to the rear wall I6, and when the window sashis raised, the rear section may be thrown back and the filter 24 readilyremoved and replaced.

The bottom wall 20, the rear wall I8, the rear I sections 46 of the end,walls 2| and the rear section 48 of the top wall I9, are all securedtogether to for'm a base unit 50 which is firmly secured' in positionwithin the window opening. To this end, straps 5I are suitably spotwelded to the bottom wall at each end thereof, and screws 52 passingthrough openings in the straps and through the window sill Ill serve toanchor the bottom'wall in position. Vertical jack screws 53 extendingthrough the bottom wall at the rear of the ventilator, engage the outersloping part of the sill tween the front and rear sections of each endwall, which means is so constructed as to provide for the removal andreplacement of the covery unit 55 on the base unit 50 only by raisingand 'screw 65.

lowering movements of the cover unit. One reason for this form ofconnecting means is to assure at all times the proper relative positionof the cover and base units when they are assembled. To this end, therear part of the forward sections 45 of the end walls 2| arerespectively provided With vertically disposed angle members 56 havingflanges 51 extending inwardly toward the casing. The angle members 56may be suitably spot welded to the forward sections 45. The rearsections 46 of the end walls are respectively provided with outwardlyextending vertical flanges 58 which, when the cover unit is placed onthe base unit, are disposed at the forward sides of the adjacent flanges51. This construction and arrangement of the flanges provides in itselfa slidable connection between the cover and base units. However, inorder to prevent any forward and backward movement of the covery unit 55when in position on the base unit 50, I provide vertical channel members60 at the rear of the flanges 58 which formA with the latter verticalgrooves 6| for receiving the iianges 51. In addition to forming one sideof the grooves 6|, the channel members 60 slidably receive the adjacentsides of.the filler blocks I5.

From the above description, it willbe apparent that the cover unit canbe removed and replaced upon the base unit only by raising and loweringthe cover unit and permitting the flanges 51 to slide vertically in thegrooves 6 I, as can be readily seen from an examination of Figs. 3 and7. When the cover unit is lowered into position on -the base unit, it isfirmly secured thereto by.

means of screws 62 passing through registering openings in the lowerrear part of the forward openings of sufcient depth to hold the screws62.

At the lower central part of the front wall I1 of the casing, the coverunit is further secured to the upstanding ange 63 by means of a screw 65passing through alined openings in the lower part of the front wall I1and in the upstanding flange 63 on the bottom wall 20, and a suitableblock 66 is also spot welded to the upstanding flange 63 for the purposeof providing a screw-threaded opening of sufcient depth to securely holdthe An angle member 10 is spot welded to a downwardly turned angeportion'1I at the rear of the front section 41 of the top wall, andprovides a longitudinally extending ledge 12 on which the forward partof the hinged rear section 48 of the top wall rests, and also provides adownwardly and rearwardly extending flange part 13 to which the upperpart of the partition 28 is suitably secured by means of screws 14. Alongitudinally extending angle member 15 is suitably spot welded to theforward part of the hinged rear section 48, and a sealing strip 16 ofany suitable material is secured to a horizontal ange 11 of the anglemember 15 and provides a sealing surface against which the sill rail Iengages. A vertical flange 18 of the angle member is arranged at theforward side of the lower sash rail Il.

The lower part of the partition 28 is provided with `a removable panelsection secured at the top thereof by screws 8| to the remaining partsof the partition and by the screws 31 to the brackets 38 which arecarried by the removable base member 33, the latter carrying themotor-driven blower unit 3|. On the rear face of the removable panelsection 80 are suitably mounted electrical control elements foreffecting and controlling the operation of the motordriven blower unit.These elements may be of any type. They are here shown to be a resistor83, a. switch 84 and an outlet 85 for receiving a cord for attachment toa suitable electrical outlet in the room (not shown). The switch 84 isprovided with an operating shaft 86 which extends forwardly through anopening in the removable panel portion 80. The forward end of the shaft86 is squared and slidably receives the rear squared end of a removableshaft extension 81. The extension 81 extends forwardly through anopening in the front wall of the casing and-is provided at its forwardend with a reduced squared section 88. An operating knob 89 is providedwith a squared recess 90 in its rear inside surface which fits over'thesquared outer end 88 of the removable extension section 81 and a screw9| extending longitudinally through the knob 89, shaft extension 81, andengages a screwthreaded opening in the switch shaft 86; thereby servingto secure the operating knob in position on the shaft extension.

Thus, when it is desired to remove the cover unit 55, the screw 9| andthe operating knob 89 are removed and the shaft extension 81 readilywithdrawn through the opening in the front wall I1. The screws 62 and 65may then be removed, the window sash raised, and the hinged rear section48 swung rearwardly out of the way. The screws 14 may then be removedand the cover unit may then be raised vertically from the base unit 50,the flanges 51 sliding upward in the'grooves 6I provided on the baseunit 50.

With the cover unit removed, if all that is needed is to make minorrepairs to the electrical control devices, the lower panel 80 of thepartition may be readily removed by removing the screws 8| and 31. 'Ihecontrol devices can then be exposed and minor repairs made thereto.Also, the working parts of the motor-driven blower unit can be oiled, ifneed be. However,

if there need be major repairs to the interior working parts of theventilator, the wing nuts 38 are removed and the motor-blower unit 3|,along with the partition 28, removed bodily from Athe casing.- The cover55 may then be replaced and the sash rail lowered and the motor-blowerpartition unit carried away to a service station where it can berepaired.

As the rear sections- 46 of the end walls 2| are set inwardly withrespect to the plane of their respective front sections 45, and` as thechannels 60 forconnecting the adjacent sides of the ller blocks to thecasing are secured to the rear sections and thereby disposed inwardly ofthe planes of the front sections, the joints between the channels andcasing and the major portions of the channels are concealed from viewfrom the front of the casing, and thereby do not detract from the neatand pleasing appearance of the casing -when installed.

As the rear section 48 of the top wall is displacedl downwardly from theplane of the front section 41 thereof, and is provided at its forwardedge with the angle member 15 having the vertical flange 18 which isdisposed at the room side of the sash rail, an *effective weather-tightseal is provided between the lower sill rail I I and the top wall I9which provides for the effective draining of rain water, snow, etc.,from the rear of the casing. The rear section 48 is formed with arearward slope, as shown, and thereby also aids in effectivelydrainingrain water from the top of the casing. f

What I claim and desireto secureby'Letters Patent of the UnitedStatesisz- 1. A ventilator flof the type adapted to be mounted over a sill ofa window with a front part facing the room and a'rear part facingl theoutside, comprising a casing including front, rear, bottom, top and endwalls; the top wall and the end walls being each divided to provideseparable front and rear sections; the rear sections of the top and endwalls, respectively, the rear wall, and the bottom wall being securedtogether to form a base unit adapted to be xedly secured in position ona window sill; the front sections of the top and end walls,respectively, and the front wall being secured together to provide aremovable cover unit; and an upright slidable connecting means betweenadjacent parts of the front and rear sections of each end Wall and soconstructed as to provide for removal and replacement of the cover uniton the base unit only by raising and lowering the cover unit withrespect to the base unit.

2. A ventilator of the type adapted to be mounted over a sill of awindow with a front` part facing the room and a rear part facing theoutside, comprising a casing including front, rear, top, bottom, and endwalls; the end walls and the top wall being each divided to providefront and rear sections; the rear sections of the end walls and the topwall, respectively, the rear wall and the bottom-wall being securedtogether to form a base unit adapted to be lxedly mounted on a windowsill; the front sections.I of the end walls and the top wall,respectively, and the front wall being secured together to form aremovable cover: unit; means providing an upright tongueand-grooveconnection between adjacent portions of the front and rear sectionscomposing each of the end walls and constructed so that the cover unitmay be removed and replaced only by raising and lowering the cover unitwith respect to the base unit.

3. In a ventilator of the type adapted to be mounted over a sill ofy awindow-with a front part facing the room and a rear part` facing theoutside, comprising a casing including front, rear, top, bottom, and endWalls; the end walls and the top wall being each divided to providefront and rear sections; the rear sections of the end walls and the topwall, respectively, the rear wall and the bottom wall being securedtogether' to form a base unit adapted to be xedly mounted on a windowsill; the Vfront sections of the end walls and the top wall,respectively, and the front wall being secured together to formaremovable cover unit; means providing an upwardly extending groove onthe forward part of each ofthe rear sections of the end walls andopening in a direction extending away from the plane of its respectiverear section; means providing an upright tongue member on the rearwardpart of each of the front 4sections of the end members; the tonguemembers being arranged to slidably t within the adjacent grooves andproviding for removal-and replacement of the cover unit only by raisingand lowering movements of the cover unit.

4. A ventilator of the type adapted to be mounted over a sill of awindow with a front part facing the room and a rear part facing theoutside, comprising a casing including front, rear, bottom, top and endwalls; the top wall and the end walls being each divided to provideseparable front and rear sections; the rear sections of the top and endwalls, respectively, the rear wall, and

the bottom wall being secured together to form a base unit adapted to befixedly secured in position on a window sill; the front sections of thetop and end walls, respectively, and the front wall being securedtogether to provide a removable cover unit; the rear section of each endwall being arranged inwardly of the plane of the adjacent front sectionand being provided at its forward edge with an outwardly extendingflange; the front section of each end wall being provided at itsrearward edge with an inwardly directed flange arranged at the rearwardside of the flange on the adjacent rear section so as to provide asliding connection therebetween which provides for the removal andreplacement of .the cover unit on the base unit only by raising andlowering the cover unit.

5. A ventilator of the type adapted to be mounted over a sill of awindow with a front part facing the room and a rear part facing theoutside, comprising a casing including front, rear, bottom, top and endwalls; the top wall and the end walls being each divided to provideseparable front and rear sections; the rear sections of the top and endwalls, respectively, the rear wall, and the bottom wall being securedtogether to form a base unit adapted to be flxedly secured in positionon a window sill; the front sections of the top and end walls,respectively, and the front wall being secured together to provide aremovable cover unit; the rear section of each end wall being setinwardly of the casing from the plane of the front section thereof; andmeans for detachably securing the cover unit tothe base unit.

6. A ventilator of the type adapted to be arranged within a windowopening defined by a lower sill rail of a partially raised window sash,a window sill and window jambs, comprising a casing adapted to bemounted over the Window sill and having a front portion arranged at theinside of the window sash and a rear portion at the outside of thewindow sash; said casing comprising front, rear, top, bottom, and endwalls; each of the end walls comprising a front section and a rearsection joining the front section along an upright line and beingdisplaced inwardly of the casing from the plane of the front section;and upright filler blocks of substantially the same height as the casingand closing the spaces between each end wall and the adjacent windowjambs; the side of each filler block which is disposed adjacentan endwall of the casing being arranged immediately to theear of thefrontsection thereof and being secured to the forward end of the rearsection thereof; and means providing a sealing connection between thelower sash rail and the top of the filler blocks and the casing topwall.

'7. A ventilator of the type adapted to be arranged 'within a windowopening defined by a lower sill rail of a partially raised window sash,a window sill and window jambs, comprising a casing adapted to bemounted over the window sill and having a front portion arranged at theinside of the window sash and a rear portion at the outside of thewindow sash; said casing comprising front, rear, top, bottom and endwalls; each of the end walls comprising a front section and a rearsection displaced inwardly of the front section and joining the latteralong an upright.

line just forward of the plane ofthe window sash; the top wallcomprising a front section and a rear section joining the front sectionjust forward of the plane of the window sash and being displaceddownwardly from the plane of the front section of the top wall; uprightfiller blocks of substantially the same height as the casing and closingthe space between each end wall and the adjacent window jamb; the sideof each filler block which is disposed adjacent an end wall of thecasing being arranged immediately to the rear of the front sectionthereof and being secured to the forward end of the rear sectionthereof; and means providing a sealing connection between the lower sashrail and the top of the llller blocks and the forward part of the rearsection of 'the top wall.

8. A ventilator of the type adapted to be arranged within a windowopening deilned by a lowersill rail of a partially raised window sash, aWindow sill and the window jambs, comprising a casing adapted to bemounted over the window sill and having a front portion thereof arrangedat the inside of the window sash and a rear prtion thereof at theoutside of the window sash; said casing comprising front, rear, top,bottom and end walls; each of the end walls being divided along anupright line to form a front section including an inwardly directedflange along its rearward edge, and a rear section set inwardly from theplane of the front section and having an outwardly directed flange alongits forward edge arranged at the forward side of the first-named flange;the lines of division between sections of the end walls being atsubstantially the same distance from the front wall; the top `wall beingdivided longitudinally into a front section and a rear section; the rearsections of the top and end walls, respectively, the rear wall and thebottom wall being secured together to form a base unit adapted tobeilxedly secured in position on a window sill with the overlappingflanges arranged slightly forward of the window sash; the front sectionsof the top and end walls, respectively, and the front wall being securedtogether to provide a removable cover unit; an upright channel membersecured to the forward part of the rear section of each end wall andbeing arranged in parallel spaced relation to the flange thereon so asto provide therewith an upright groovefor receiving the flange on theadjacent front section and providing a slidable connection between thecover unit and the base unit; upright filler blocks of substantially thesame height as the casing and closing the spaces between the end wallsand the adjacent window jambs, and having the sides thereof adjacent theend walls disposed within the channels carried thereby; and ineansproviding a sealing connection between the lower sash rail and the topof the filler blocks and the forward part of the rear section of the topwall.

' 9. A ventilator of the type adapted to be mounted over a sill of awindow with the front 'part facing the room and the rear part facing theoutside, comprising a casing including front, rear, bottom, top and endwalls; each of the end walls being divided along an upright line into afront section and a rear section, with the latter being displacedinwardly of the casing from the plane of the front section and with thelines of division of both end walls at substantially the same distancefrom the'front wall; the top wall being divided into a front section anda rear section with the line of division being substantially parallel tothe front wall and spaced from the front wall substantially the samedistance as the lines v curing the cover unit to the base unit.

10. A ventilator of the type adapted to be mounted over a sill of awindow with a front part facing the room and a rear part facing theoutside, comprising a, casing including front, rear, bottom, top and endwalls; the top and the end walls being each divided to provide separablefront and rear sections; an upright partition arranged lengthwise of thecasing and dividing the latter into a rear air chamber and a front airchamber; a motor-blower unit arranged within one of said chambers andoperating to force air through said casing for Ventilating the room;means for detachably securing the partition and motor-blower unit to thebottom wall of the casing; the rear sections of the top and end walls,respectively, the rear wall, and the bottom wall being secured togetherto form a base unit adapted to be ixedly secured in position on a windowsill; the front sections of the top and end walls, respectively, and thefront wall being secured together to provide a removable cover unit; anupright slidable connecting means between adjacent parts of the frontand rear sections of each end wall and so constructed as to provide forremoval and replacement of the cover unit on the base unit only byraising and lowering the cover unit with respect to the base unit; andmeans for detachably securing the rear part of the front secti-on of thetop wall to the upper part ofthe partition, and for detachably securingthe lower part ofthe cover unit to the bottom wall of the casing.

11. A ventilator of the type adapted to be mounted over a window sillwith a front part facing the interior of a room and a rear part facingthe outside, comprising a casing including a base unit and a removablecover unit; the base unit being xedly secured to the window sill andincluding a bottom wall and a rear wall secured to one another; thecover unit including a front wall and a top wall part secured togetherand de- 'tachably secured to the base unit; an upright partitionextending lengthwise of said casing and dividing the interior thereofinto a rear inlet chamber and a front outlet chamber; ,/said partitionincluding a removable panel portion; means accessible from said inletchamber for detachably securing the panel portion in position; amotorblower unit in said rear inlet chamber; and electrical devicescarried by the rear side of said removable panel portion for effectingand controlling the operation of said motor-blower unit.

12. A ventilator of the type adapted to be mounted over a sill of aWindow with a front partY facing the room and a rear part facing theoutside, comprising a casing including front, rear, bottom, top and endwalls; the casing having an air opening in the rear part thereof and anair opening in the front part thereof; anupright partition extendinglengthwise of said casing and dividing the interior thereof into a rearair chamber and a front air chamber; said partition including aremovable panel portion; means accessible from the front air chamber fordetachably securing the removable panel portion in position; amotorblower unit arranged within the rear air chamber, and beingoperable to draw air in through one of said openings and force such airthrough the other of said openings; electrical devices carried by therear side lof said panel portion for effecting and controlling theoperation of said motor-blower unit; the casing top wall and thecasingvend walls being each divided to provide separable front and rearsections; the rear vsections of the topy and end walls, respectively,the rear wall, and the bottom wall being secu'red together to form abase unit adapted to be xedly secured in position on a window sill; thefront sections of the top and i end walls, respectively, and the frontWall being secured together to provide Aa removable cover unit; andmeans for detachably securing the cover unit to the base unit.

13. A ventilator of the type adapted to 4be mounted over a window sillwith a front-part fac- L ing the interior of a room and a rear partfacing the outside, comprising a casing including a base unit adapted tobe xedly secured to the window sill and a front removable cover unit;upright slidable connecting means between adjacent parts of the baseunit and cover unit and so constructed as to provide for removal andreplacement ofthe coverunit on the base unit only by raising andlowerig/the cover unit with respect to' the base unit; the base unitincluding a bottom wall and a rear wall secured to one another; thecover unit including a front wall and a top wall part secured to oneanother; a motor-blower unit arranged within said casing and operatingto move air through said casing and ventilate the room; a c

switch xedly secured inside of said casing for controlling the operationof said motor-blower unit and including an operating shaft having aremovable extension extending forwardly and exteriorly of said casingthrough said front wall; and an operating knob at the outside of Saidfront wall and detachably secured to the outer end of the removableextension.

14.*A ventilator of the type adapted to be mounted over a window sillwith a front part facing the interior of a room and a rear part facingthe outside, comprising a casing including a base unit adapted to beiixedly secured to the window sill and a removable front cover unit;upright slidable connecting means between adjacent parts of the baseunit and cover unitI and so constructed as to provide for removal andreplacement of the cover unit on the base unit only by raising andlowering the cover unit with respect to the base unit; the base unitincluding a bottom wall and a rear wall secured to one another; thecover unit including a front wall and a top wall part secured to oneanother; an upright partitionextending lengthwise of said casing anddividing the interior thereof into a rear inlet chamber and a frontoutlet chamber; said partition including a removable panel portion;means accessible from said inlet chamber for detachably securing thepanel portion in position; a motor-blower unit in said rear inletchamber; an electrical switch carried by the removable panel portion atthe rear side thereof for controlling the operation of said motor; saidswitch including an operating shaft extending 'forwardly through theremovable panel and having a removable extension extending forwardlythrough the inlet chamber and through the front wall of the casing; andan operating knob at the front side of said front wall and detachablysecured to the outer end of the removable extension of theswitch-operating shaft.

15. A ventilator of the type adapted to be mounted over a sill of4 aWindow with a front 5 r)art facing the room and a rear part facing theoutside, comprising a casing including front, rear, bottom, top and endwalls; the casing having an air opening in the rear part thereof and anair opening in the front part thereof; the top Wall and the end wallsbeing each divided into separate front and rear sections; the rearsections of the top and end walls, respectively, the rear wall, and thebottom wall being secured together to form a base unit adapted to be xedin position on a window sill; the front sections of the top and endwalls, respectively, and the front wall being secured together toprovide a'removable cover unit; -means for detachably securing the coverunit to the base unit; a motor-blower unit removably mounted in saidcasing and operable to draw air through one of said air open ings andforce such air through the other of said air openings; said motor-blowerunit being supported by said bottom wall and including that part of thebottom wall which extends forwardly of the rear sections of said top andend walls, so that said motor-blower unit may be removed from the frontwhen said cover unit is removed and without disturbing the mounting ofsaid base 3o unit; and means accessible when said cover unit is removedfor detachably' securing said motorblower unitto said bottom wall.

16. A ventilator of the type adapted to b mounted over a sill of awindow with a front part facing the room and a rear part facing the out-5 side, comprising a casing including front, rear, bottom, top and endwalls; the top and the end walls being each divided into separate frontand rear sections; an upright partition arranged lengthwise of thecasing and dividing the latter 10 into a rear air chamber and a frontair chamber; a motor-blower unit arranged within one of said chambersand operable to force air through said casing for Ventilating the room;means for detachably securing the partition and motor- 15 blower unit tothe bottom wall of the casing; the rear sections of the top and endwalls. respectively, the rear wall, and the bottom Wall being securedtogether to form a base unit adapted to be fixed in position on a windowsill; the -front 20 sections of the top and end walls, respectively, andthe front Wall being secured together to provide a removable cover unit;and means for detachably securing the cover unit to the base unit andincluding means for securing the rear part 25 of the front section ofthe top wall to the upper part of the partition, and for securing thelower part of the cover unit to the bottom wall of the casing.

IIFRANL CIS C. KILB..

